In a reflector antenna[?], the relative reduction in the effective aperture of the antenna caused by the masking effect of other antenna parts, such as a feed horn or a secondary reflector, which parts obstruct the radiation path.
... Port Arthur (Lushun)[?] starts Russo-Japanese War
February 23 - For $10 million the United States gains control of the Panama Canal Zone.
March 3 - Kaiser Wilhelm II ...